 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
During an episode with weak radios, ZID controller gave B737 an immediate descent to FL280 from FL290. Pilot received TCASII TA 900 ft above and 8 mi horizontal.
| Attributes | |
| ACN | 407970 |
| Time | |
| Date | 199807 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bwg |
| State Reference | KY |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 205 flight time total : 6900 flight time type : 605 |
| ASRS Report | 407970 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 48000 vertical : 900 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
ZID had weak radio frequency 134.07. When I was at position 20 mi northeast of bwg, I inquired about weak radio/bad reception. Controller gave an immediate descent to FL280 (possible traffic conflict). No turns were given. TCASII gave TA for traffic 900 ft above when I was leveling at 8 mi at FL280. Reason for possible loss of separation was bad radio and frequency congestion.
Original NASA ASRS Text
Title: DURING AN EPISODE WITH WEAK RADIOS, ZID CTLR GAVE B737 AN IMMEDIATE DSCNT TO FL280 FROM FL290. PLT RECEIVED TCASII TA 900 FT ABOVE AND 8 MI HORIZ.
Narrative: ZID HAD WEAK RADIO FREQ 134.07. WHEN I WAS AT POS 20 MI NE OF BWG, I INQUIRED ABOUT WEAK RADIO/BAD RECEPTION. CTLR GAVE AN IMMEDIATE DSCNT TO FL280 (POSSIBLE TFC CONFLICT). NO TURNS WERE GIVEN. TCASII GAVE TA FOR TFC 900 FT ABOVE WHEN I WAS LEVELING AT 8 MI AT FL280. REASON FOR POSSIBLE LOSS OF SEPARATION WAS BAD RADIO AND FREQ CONGESTION.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.